Nitrogen blowing instrument and wet digestion method using same

Abstract

The invention discloses a nitrogen blowing instrument. The nitrogen blowing instrument comprises a bracket, a shell on which a pipeline is placed, a blowing needle and a heating device, wherein the shell with the pipeline is fixed on the upper part of the bracket, the heating device is fixed at the lower part of the bracket, the lower surface of the shell with the pipeline is provided with the detachable blowing needle, the blowing needle is connected with the pipeline, and the pipeline and the blowing needle are made from polytetrafluoroethylene and copolymer thereof. The invention further discloses a wet digestion method using the nitrogen blowing instrument. The method comprises the following steps: 1) placing a sample and a reaction reagent in a digestion cup; 2) placing the digestion cup on the heating device of the nitrogen blowing instrument; 3) placing the blowing needle of the nitrogen blowing instrument in the digestion cup and introducing a protection gas; and 4) setting or changing the heating temperature of the heating device according to a preset digestion temperature according to the types of the sample and the reaction reagent. The nitrogen blowing instrument disclosed by the invention is simple in structure, and is capable of effectively preventing explosion when applied to wet digestion, the security of the operation is improved, the secondary pollution of metal can be effectively avoided, and the accuracy of the detection result is guaranteed.

Description

technical field [0001] The invention relates to the technical field of experimental equipment, in particular to a nitrogen blowing instrument and a wet digestion method using the nitrogen blowing instrument. Background technique [0002] Wet digestion, also known as wet ashing or wet oxidation, adds an oxidizing strong acid to an appropriate amount of food and heats and digests it at the same time to decompose and oxidize organic matter into CO 2 , water and various gases, in order to accelerate the oxidation, various catalysts can be added at the same time. This method of destroying organic substances in food is called wet digestion. Biological samples containing a large amount of organic matter are usually wet-digested with mixed acids, including HN0 3 -HClO 4 , HN0 3 -HCl0 3 -HClO 4 、HNO 3 -HClO 4 -H 2 SO 4 , HN0 3 -H 2 S0 4 、H 2 SO 4 -H 2 o 2 and HNO 3 -H 2 0 2 . Among them, nitric acid with a boiling point above 120°C is a widely used pre-oxidant, wh...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of existing wet digestion, the present invention provides a new nitrogen blowing instrument, and at the same time provides a method for using the nitrogen blowing instrument for wet digestion. The nitrogen blowing instrument of the present invention has a simple structure and can effectively prevent the detection of environmental The interference of the background value on the target detection component, and will not cause contamination to the sample

The wet digestion method of the present invention can effectively solve the problems in the prior art that the wet digestion is prone to explosion, high risk of operation, and secondary pollution

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